Spellman High Voltage Electronics Corp. has notified the state that it plans to lay off 47 Long Island workers in February and close its Bohemia plant, shifting the jobs to Mexico.

The Hauppauge-based company, which designs and manufactures DC high voltage power supplies for medical, industrial and scientific uses, said in a notice filed last week with the state Department of Labor that on Feb. 3 it would close its plant at 30 Crossway East in Bohemia, laying off 20 workers there.

The required Worker Adjustment and Retraining Notification Act filing, or WARN notice, also said the company will lay off 27 printed circuit board assemblers at Spellman's corporate headquarters at 475 Wireless Blvd., Hauppauge, where it employs 290.

Human resources vice president David Edwards said the company was moving all of its printed circuit assembly work to Mexico, citing lower costs in that country as one factor.

Spellman's website said it has two plants in Matamoros, Mexico, just south of the Texas border. One, just expanded, is 162,000 square feet and is staffed by 900 assemblers and technicians, the website said. The plant produces finished products and critical subassemblies used at other Spellman facilities in New York and in the United Kingdom.

Its other plant in Matamoros is a 75,000-square-foot metal stamping and machining operation supporting the main Mexican plant, the website said. Its 65,000-square-foot Bohemia plant performed essentially the same tasks, said Edwards.

The company website also lists locations in China, Japan, Germany and South Korea, and one in upstate Valhalla. Edwards said the company employs about 1,400 worldwide.

Last year the Suffolk County Industrial Development Agency agreed to refinance $5.2 million in debt for Spellman, which said it would use the savings to buy equipment for facilities in Hauppauge and Bohemia.

The company also was to receive a $34,000 sales-tax exemption from the agency and $100,000 off the mortgage recording tax. The project's total cost was $9.5 million. At the time, Spellman said it had 344 workers on Long Island and had openings for 15 more.